Printing-press-tympan bail.



S. L. HOWARD.

PRINTING PRESS TYMPAN BAIL.

III/VENTOR .Lho ward.

WITNESSES A TTOR/VEYS CULUMBIA PLANOGRAPH (20., WASHINGTON, B. c.

SAMUEL L. HOWARD, OF CHICAGO, ILLINOIS.

PBINTING-PRESS-TYMPAN BAIL.

Specification of Letters Patent.

Patented Aug. 17, 1915.

Application filed May 28, 1915. Serial No. 30,917.

To all whom it may concern Be it known that I, SAMUEL L. HOWARD, acitizen of the United States, and resident of Chicago, in the county ofCook and State of Illinois, have invented a new and Improved Printing-Press-Tympan Bail, of which the following is a full, clear, and exactdescription.

Among the principal objects which the present invention has in view are:to provide a printing press with means for preserving tympan sheets andthe make-ready secured thereon when the same is removed from service onthe press; and to provide a simple, efiicient construction formaintaining the original registration of the makeas on the line 3 ready.

Drawings.-Figure 1 is a perspective view of a printing press platenhaving a tympan bail constructed and arranged in accordance with thepresent invention, said bail being shown in service relation. Fig. 2 isa perspective view on an enlarged scale, showing a bail constructed andarranged in accord ance with the present invention; Fig. 3 is a detailview on an enlarged scale, showing an edge fragment of the platen, abail constructed in accordance with the present invention in servicerelation thereto, and a clamp partially holding a tympan sheet on saidbail, said figure being a section taken 3 in Fig. 1; Fig. & is a sectionon a similar scale, taken as on the line 47-4: in Fig. 1; and Fig. 5 isa section on a similar scale, taken as on the line 55 in Fig. 1.

DescMptz'0n. -As seen in the drawings,the platen 10 is provided at thelower edge with a swinging bail 11 of conventional form. When the bail11 is depressed, as seen in Fig. 1 of the drawings, the tympan sheet 12is clamped in service relation to the platen and is there held firmly.The upper or outer edge of the tympan sheet 12 when mounted inaccordance with the present invention, is clamped to the bail 13 by theclamp bar 14:. To this end, as seen best in Figs. 3 to 6 inclusive, thetympan sheet 12 is folded over the upperand outer edges of he bail 13and in this position drawn taut.

To hold the sheet 12 on the bail 13 and when the said bail is swung torelieve the tension on the sheet.12, or to permit access to the underside thereof, is the function of the bar 14:. The bar 14 is supported onthe bail 13 by pins 15, which extend through perforations 16 in the saidbail. The pins 15, as seen best in Fig. 4 of the drawings, are pointedto puncture or pierce the material forming the sheet 12 where it isstretched across the entrance to the said perforations. The pins 15 alsooperate as pivots on which to swing the locking levers 17 into serviceposition. Each lever 17 has a handle 18 extended in the same plane withthe body portion-of the lever and a clip hook 19 extended from the sidethereof adjacent the said bail 13, the clip hooks 19 having each ablade-like extension to out a slot in the tympan sheet and to enterrecesses 20 provided in the bail 13.

Operatz'0n.The tympan sheet 12 is disposed on the platen 10 and theresecured by the bail 11 in the conventional manner. At the upper or outeredge of the platen, the

tympan sheet 12 after being drawn taut is passed over the bail 13 andaround the same to extend between the edge of the platen 10 and saidbail, as shown best in Figs. 3 to 5 inclusive. After the bail 13 hasbeen lifted, it will be seen that as the same is swung to the serviceposition shown in Fig. 1 of the drawings, the tension on the sheet 12 isaugmented or increased, drawing the said sheet more evenly and tighterover the platen 10. After the sheet 12 is thus set, the clamp bar 14 isplaced on the bail 13, the pins 15 being forced through the outersection of the sheet 12, as seen best in Fig. 4: of the drawings. Thelevers 17 are'disposed in a standing or perpendicular position, such asshown at the left of Fig. 2 and also as shown in Fig. 3 of the drawings.The edge of the hook 19 is sharpened to cut through the sheet 12 and ispreferably elongated to hold the said sheet 12. When the levers 17 aredisposed as shown in Figs. 4: and 5 of the drawings, or at the right ofFig. 2 of the drawings, they avoid other parts of the printing press,while the same is operated.

If the tympan sheet 12 having been set, registering pins or make-readyis required, the said sheet may be lifted away from the face of theplaten, the bail 13 swinging on its pivot to this effect. If theoperator desires, the sheet may be removed from the platen withoutdisturbing the make-ready or registering pins thereon. When in thecourse of operation, the attendant wishes to replace the sheet 12 withthe make-ready,

this is usually accomplished by first adjusting the perforated end ofthe said sheet on the bail l3 and to the bar 1 1 and levers 17 thereof.In making this adjustment care is exercised to dispose the hooks 19 ofthe levers 17 in the cuts previously formed thereby in the said sheet.The readjustment of the sheet bein thus secured at the upper end, thebail 11 1s tightened over the lower end of the sheet and the tympansheet will be found to be adjusted to the work to be performed by it.

Claims:

1. A bail as characterized comprising a swinging bar having a series ofsocket members; a clamp bar disposed on said swinging bar; and aplurality of levers pivotally mounted on said clamp bar, said levershav- Copies of this patent may be obtained for five cents each, byaddressing the Comm 7 Washington, D. 0.

ing each a clip hook for insertion within one of said socket members. I

2. A bail as characterized comprising a swinging bar having a series ofsocket members; a clamp bar disposed on said swinging bar; a pluralityof levers pivotally mounted on said clamp bar, said levers having each achp hook for insertlon w1th1n one of sald socket members; and a seriesof locating SAMUEL LQHOWARD. Witnesses A. C. THUMM, RUSSELL LA STRANGE.

issioner of Patents.

